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OK, I was getting that impression; though I'm still curious as to why they would make two types that are exactly the same. No. I'm just replacing a partially blocked nozzle with a new one. I'm not intending to make any other adjustments, so the combustions levels shouldn't change. When it...

Yes WDIK, I saw that, but that just confirms that H and EH have the same 'hollow' spray pattern; it doesn't say what the difference between H and EH is. However, the product range page says that the EH range are "Special nozzles for oil burners used on kerosene", but does say what makes them...

I ordered a couple of replacement nozzles recently for my Sterling 40 oil burner. I asked for Danfoss 0.65 80EH but was sent 0.65 80H. When challenged to resend me the right ones, the supplier has tried to assure me that the H type are interchangeable with the EH type - so no problem. Or is...

OK, so here's the end of the story... I hope. I tested the resistance of the coil just after the burner had shut down, and (just as predicted) it was open circuit. Had to wait a while for a replacement coil ('overnight' delivery by FedEx took three days!) but it was only a five...

Wow, quite a flurry of activity over the past few hours!... I'll definitely try testing the resistance of the coil tonight, but I've stuck my neck out and order a replacement anyway. If it turns out to be the pump, at least I'll have a spare coil if it fails later in life. Just an aside -...

OK, so thanks to the suggestions posted earlier, I connected test leads to the valve solenoid circuit. At startup, current flowed to the solenoid, the valve opened and burned for 4 minutes. Then the flame went out and the valve was switched off ... the two things happened almost at the same...

Thanks for your comments oilman. I guess fitting a new coil on the value is the only way I'm going to know if it's this that's causing the problem or not. :roll: Any other advice on isolating the problem would be appreciated. The boiler itself has given pretty good service since it was...

Thanks for the quick responses! The burner is only running for a couple of minutes, so nothing has much chance of getting warm - the external wiring to the solenoid valve is definitely still cold when the burner goes out. However, your suggestions has made me think there could be...

Background: HCC Thermotronic T2 oil-fired condensing boiler, that uses a Sterling 40 burner, which is fitted with a Danfoss BFP11 pump. Fault: When first switched on, the burner fires up and runs normally for about 4 minutes. Then the flame goes out, and the burner locks-out after a few...